public class Example4_10 {
  public static void main (String args[]) {
    Lader1.下底=100;
    Lader1 laderOne =new Lader1();
    Lader1 laderTwo =new Lader1();
    laderOne.设置上底(28);
    laderTwo.设置下底(66);
    System.out.println("laderOne的上底："+laderOne.获取上底());
    System.out.println("laderOne的下底："+laderOne.获取下底());
    System.out.println("laderTwo的上底："+laderTwo.获取上底());
    System.out.println("laderTwo的下底："+laderTwo.获取下底());
  }
}
